Firearms – Safety mechanism – Firearm lock
Patent
1993-01-14
1994-07-26
Johnson, Stephen M.
Firearms
Safety mechanism
Firearm lock
F41A 1744
Patent
active
053317599
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a safety lock preventing the introduction of a live round to the firing chamber of firearms which eject by automatic, semi-automatic or manual means the spent cartridge case from the chamber of the weapon through an ejection port. A further application of the lock is to block alignment of the cylinder of so-called revolvers with the barrel, preventing firing.
The purpose of the lock is to render the firearm safe when not in its intended use, but to allow its rapid return to such use by quick removal of the lock from the firearm, which can remain with its magazine or cylinder in its loaded state.
An objective of the invention is to disable the firearm to prevent its accidental or unauthorised discharge by persons not in custody of the key separable from the body of the lock inserted in the firearm; yet to render its enablement rapid and simple by use of the key to permit removal of the lock from the firearm.
Another objective of the invention is to enable the custodian of the firearm and the lock to have the lock available at all times by carrying it on a key-ring or similar implement to which the key remains attached until separated from the firearm when the lock is installed in the firearm and to which the body of the lock becomes reattached on removal from the firearm.
A further objective of the invention is to enable custodians of more than one weapon, regardless of calibre or model, to require only one key for all locks emplaced in those firearms by virtue of the common-keying of the locking mechanism, thus preventing confusion among different keys in cases of emergency and inconvenience arising from the loss of the key to a particular lock.
SUMMARY OF THE INVENTION
According to the present invention the lock has a body comprising two mirror halves joined together at assembly; a lock bolt (a cylindrical, conical, pointed shaft) contained in an outer cylinder (which is an integral part of the body) of slightly greater diameter permitting the bolt to move back and forth within it, the assembly resembling a firearm cartridge; an activating slide (a cylindrical shaft) that gives motion to the lock bolt through a pivoted lever and is also part of the locking unit; the pivoted lever that connects the slide and lock bolt and transmits motion from one to the other; a lock cylinder assembly that allows or prevents movement of the slide through the body from side to side, depending on the position of the cylinder, having as components the activating slide, a locking dog (a moveable double lug section activated by a spring and a key), and the spring (which keeps an upward force on the locking dog); the key, retained in the cylinder when unlocked and removeble when the cylinder is locked; and a dedent plate offering slight resistance to movement of the lever in the unlocked position.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention is now described by example only with reference to the accompanying drawings.
FIG. 1 is a side view of a lock in accordance with the invention with the activating slide 3 and the locking bolt 2 in solid outline in the unlocked position and in broken outline in the locked position; and the key inserted in the body.
FIG. 2 is a key-end view of a lock with the key removed.
FIG. 3 is a sectional side view of the components of a lock and their positions in the unlocked condition.
FIG. 4 is a sectional side view of the components of a lock and their positions in the locked condition.
FIG. 5 is a sectional side view, at ninety (90) degrees to the view in FIG. 4, of the positions of components of a lock cylinder in locked condition.
FIG. 6 is a sectional side view, at ninety (90) degrees to the view in FIG. 3, of the positions of components of a lock cylinder in unlocked condition.
FIG. 7 shows the position of a lock in the ejection port of a firearm with the lock bolt extended into the barrel from the rear, in the locked condition with key removed.
For firearms with ejection ports, the lock is inserted into the
REFERENCES:
patent: 2997802 (1961-08-01), Robbins
patent: 3018576 (1962-01-01), Riechers
patent: 3022598 (1962-02-01), Wikstrom
patent: 3089272 (1963-05-01), McKinlay
patent: 3360880 (1968-01-01), Finnegan
patent: 3605311 (1971-09-01), Hermann
patent: 4709496 (1987-12-01), Johnson
patent: 4827649 (1989-05-01), Sheehan
patent: 5235763 (1993-08-01), Nosler et al.
Marceau Carol A.
Marceau Ian W.
McHue Edith
McHue Keith F.
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